Point exchange

Point exchange is a cut pre-release feature of Doom Eternal which could be used in-game as a bug. It was used to exchange 10 weapon points for 1 mastery token. This is known because of a bug in certain versions of the game where this still worked, making it impossible to upgrade all of your weapons. It appears to have primarily been a means to exchange different types of upgrades received by the player (referred to internally as "currencies") for weapon mastery tokens. These tokens simply appear in the final game as a collectible item instead of being "purchased" in this manner. Weapon points are particularly singled out as convertible to mastery tokens. The fact that there are more weapon points available than can be used seems to have been a motivating factor for this feature, but it was ultimately not included, probably to simplify or more closely control player progression.

Point exchange console
The point exchange console can be found on the right-hand side (if facing toward the slipgate generator) of the main bridge of the Fortress of Doom, opposite the station where the Doom Slayer collects upgrades for the equipment launcher. This console has no use in the final game. In earlier release versions of the game, the console screen on the unit (which is normally powered off) would be erroneously in a powered-on state during the event where the Slayer restores power to the station by using the demonic Crucible. At this time only, it would display a texture which reads "Point Exchange", but even in this state it remained non-interactive. This behavior was silently patched out of the game in one of its updates.

Similar removed features
Another exchange feature is also mentioned by strings in the executable for extra lives, but it seems to have been a separate function from the point exchange.